Matrices · manipulative
Pups grow into older classes on a rocky beach. The Leslie matrix is the birth and survival rules that turn this year’s colony into next year’s.
Age classes
The story this year
Birth & survival rules (= Leslie matrix L)
Top row: pups born per older class · Subdiagonal: survival into the next age
Time
Jump recomputes instantly (no 20-year animation). Next year still plays the three-act story.
In matrix form
Beach shows whole seals. The vector keeps decimals for next year.